..., almost unchanged. 8.Insulation resistance:PB pipe because the thermal conductivity coefficient of only pipe l/250, brass l/1700 so their insulation, the cooling effect is strong , therefore suitable for hot and cold...

..., almost unchanged. 8.Insulation resistance:PB pipe because the thermal conductivity coefficient of only pipe l/250, brass l/1700 so their insulation, the cooling effect is strong , therefore suitable for hot and cold...

..., almost unchanged. 8.Insulation resistance:PB pipe because the thermal conductivity coefficient of only pipe l/250, brass l/1700 so their insulation, the cooling effect is strong , therefore suitable for hot and cold...